Malicious PDF — malware analysis report

Static analysis result for SHA-256 24c6e0c5cbc56a34…

MALICIOUS

PDF

85.5 KB Created: 2021-09-16 07:44:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 97f6c04a553f699f772eb7c9b41b7dfe SHA-1: ead16eed569cacafa2b81c26219f0c13d69dfe47 SHA-256: 24c6e0c5cbc56a34b95d2ea68fc29e25cb6d7b0701d297b1184c48e0fbee286c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of multiple external URIs and the nature of the hosting point towards a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://crewmak.ru/uplcv?utm_term=my+singtel+app+android PDF link annotation
    • http://bkmarine.net/ckfinder/userfiles/files/1630781319.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/dejifezas.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/femogetazagaruwusox.pdfIn PDF document text
    • https://groupekheidri.com/ckfinder/userfiles/files/12044572708.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/susibuguvorokavo.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/bd54ec91d048817674da3a6607b552c6/rudaf.pdfIn PDF document text
    • http://confidenzacsapagy.hu/upload/51567173834.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/xusigufabis.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/6224417634.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/koretavipivada.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/42218997455.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/nimele.pdfIn PDF document text
    • https://springkasteelhuren.be/userfiles/file/46259040940.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/sotajegonekawozi.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/muvaporefuwi.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/72227758411.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16131b98ba4cad---retebili.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16135cc44d4034---59014497860.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/56550946510.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/76179425919.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/nudazemarenisekivekiw.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/7212981337.pdfIn PDF document text
    • https://chulintemple.house-well.com/CKEdit/upload/files/rubofuxamokijazamosuloze.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10349 10676 bytes
SHA-256: 273a312b7332c988f73654d684235a0e92cc9e385f67db2dfb9dc669f3e50417
font_02_sfnt_off00011ba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA6 17548 bytes
SHA-256: e221e82185a2c419f5f9bb3f70a4447b8c99ce174238e1014f175074c7df901c